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Exploring neutrino mass and mass hierarchy in interacting dark energy models

Science China(Physics,Mechanics & Astronomy) 2020年第2期63卷 55-63页

作者： Lu Feng Hai-Li Li Jing-Fei Zhang Xin Zhang College of Physical Science and Technology Shenyang Normal UniversityShenyang 110034China Department of Physics College of SciencesNortheastern UniversityShenyang 110819China Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern UniversityShenyang 110819China Center for High Energy Physics Peking UniversityBeijing 100080China Center for Gravitation and Cosmology Yangzhou UniversityYangzhou 225009China

We investigate how the dark energy properties impact the constraints on the total neutrino mass in interacting dark energy（IDE）models. In this study, we focus on two typical interacting dynamical dark energy models, i.e., the interacting w cold dark matter（IwCDM） model and the interacting holographic dark energy（IHDE） model. To avoid the large-scale instability problem in IDE models, we apply the parameterized post-Friedmann approach to calculate the perturbation of dark energy. We employ the Planck 2015 cosmic microwave background temperature and polarization data, combined with low-redshift measurements on baryon acoustic oscillation distance scales, type Ia supernovae, and the Hubble constant, to constrain the cosmological parameters. We find that the dark energy properties could influence the constraint limits on the total neutrino mass. Once dynamical dark energy is considered in the IDE models, the upper bounds of ∑mν will be changed. By considering the values of χmin2 , we find that in these IDE models the normal hierarchy case is slightly preferred over the inverted hierarchy case; for example, ?χ2= 2.720 is given in the IHDE+∑mν model. In addition, we also find that in the Iw CDM+∑mν model β = 0 is consistent with current observational data inside the 1σ range, and in the IHDE+∑mν model β > 0 is favored at more than 2σ level.

关键词： neutrino mass mass hierarchies of neutrinos interacting dark energy cosmological observations cosmological constraints

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Prospects for constraining interacting dark energy models with 21 cm intensity mapping experiments

arXiv

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arXiv 2021年

作者： Zhang, Ming Wang, Bo Wu, Peng-Ju Qi, Jing-Zhao Xu, Yidong Zhang, Jing-Fei Zhang, Xin Department of Physics College of Sciences MOE Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China

We forecast constraints on cosmological parameters in the interacting dark energy models using the mock data generated for neutral hydrogen intensity mapping (IM) experiments. In this work, we only consider the interacting dark energy models with energy transfer rate Q = βHρc, and take BINGO, FAST, SKA1-MID, and Tianlai as typical examples of the 21 cm IM experiments. We find that the Tianlai cylinder array will play an important role in constraining the interacting dark energy model. Assuming perfect foreground removal and calibration, and using the Tianlai-alone data, we obtain σ(H0) = 0.19 km s−1 Mpc−1, σ(Ωm) = 0.0033 and σ(σ8) = 0.0033 in the IΛCDM model, which are much better than the results of Planck+optical BAO (i.e. optical galaxy surveys). However, the Tianlai-alone data cannot provide a very tight constraint on the coupling parameter β compared with Planck+optical BAO, while the Planck+Tianlai data can give a rather tight constraint of σ(β) = 0.00023 due to the parameter degeneracies being well broken by the data combination. In the IwCDM model, we obtain σ(β) = 0.00079 and σ(w) = 0.013 from Planck+Tianlai. In addition, we also make a detailed comparison among BINGO, FAST, SKA1-MID, and Tianlai in constraining the interacting dark energy models. We show that future 21 cm IM experiments will provide a useful tool for exploring the nature of dark energy and play a significant role in measuring the coupling between dark energy and dark matter. © 2021, CC BY.

关键词： Galaxies

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Fs-Woa-Stacking: A Novel Ensemble Model for Early Diagnosis of Breast Cancer

SSRN

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SSRN 2024年

作者： Xiao, Tianyun Kong, Shanshan Zhang, Zichen Liu, Fengchun Yang, Aimin Hua, Dianbo Hebei Key Laboratory of Data Science and Application North China University of Science and Technology Hebei Tangshan063210 China The Key Laboratory of Engineering Computing in Tangshan City North China University of Science and Technology Hebei Tangshan063210 China College of Science North China University of Science and Technology Hebei Tangshan063210 China Hebei Engineering Research Center for the Intelligentization of Iron Ore Optimization and Ironmaking Raw Materials Preparation Processes North China University of Science and Technology Hebei Tangshan China Tangshan Intelligent Industry and Image Processing Technology Innovation Center North China University of Science and Technology Hebei Tangshan China Beijing Sitairui Cancer Data Analysis Joint Laboratory Beijing101149 China

In this paper, a new integrated scheme is proposed to accurately predict breast cancer, help doctors make early diagnosis and treatment plans, and improve the prognosis of patients. We selects five mainstream machine learning models: support vector machine (SVM), artificial neural network (ANN), random forest (RF), extreme gradient boosting (XGBoost) and adaptive boosting (AdaBoost). The Wisconsin Breast Cancer database (WBCD) and Wisconsin Diagnostic Breast Cancer (WDBC) are used as datasets to investigate the predictive performance of these single and ensemble models. Then, we use multiple linear regression method for feature selection (FS), the experimental results show that the change of feature subset will significantly affect the performance of the model. After that, we apply whale optimization algorithm (WOA) to optimize the hyperparameters of the model to improve their prediction performance. In addition, we ensemble these models by stacking, investigate the performance changes of the ensemble model when different models are used as meta learners. Finally, the FS-WOA-Stacking model achieves 99.56% accuracy on WBCD and 99.65% accuracy on WDBC. Compared with the existing breast cancer prediction models, the performance of the proposed model is at an excellent level. © 2024, The Authors. All rights reserved.

关键词： Adaptive boosting

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A Discussion of the Mapping from the Unified Search Space to the Search Space of the Optimized Task in Evolutionary Multitasking optimization

A Discussion of the Mapping from the Unified Search Space to...

引用

Chinese Automation Congress (CAC)

作者： Shuangshuang Yao Zhiming Dong Xianpeng Wang Qingqing Liu Hangyu Lou Yumeng Zhao College of Information Science and Engineering Northeastern University Shenyang China Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang China Institute of Industrial & Systems Engineering Northeastern University Shenyang China

ISBN: (纸本)9781665426480

Multitasking evolutionary algorithms enable the communication of information between different tasks and the mining of valuable knowledge by encoding all individuals into a unified search space. The mapping of decision variables of the same dimension for different tasks in the unified search space has the same dimensional index, i.e., the same encoded position. In this paper, we disrupt this mapping relationship so that decision variables of the same dimension for different tasks correspond to different encoded positions in the unified search space, to analyze and discuss the effect of this mapping relationship on the performance of the algorithm. A series of experimental results suggest that the mapping relationship between the decision variables of different tasks in a multitasking evolutionary algorithm has a significant impact on the performance of the algorithm.

关键词： Automation Evolutionary computation Multitasking Encoding Indexes Task analysis optimization

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A forecast of using fast radio burst observations to constrain holographic dark energy

arXiv

引用

arXiv 2021年

作者： Qiu, Xing-Wei Zhao, Ze-Wei Wang, Ling-Feng Zhang, Jing-Fei Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China MOE Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China

Recently, about five hundred fast radio bursts (FRBs) detected by CHIME/FRB Project have been reported. The vast amounts of data would make FRBs a promising low-redshift cosmological probe in the forthcoming years, and thus the issue of how many FRBs are needed for precise cosmological parameter estimation in different dark energy models should be detailedly investigated. Different from the usually considered w(z)-parameterized models in the literature, in this work we investigate the holographic dark energy (HDE) model and the Ricci dark energy (RDE) model, which originate from the holographic principle of quantum gravity, using the simulated localized FRB data as a cosmological probe for the first time. We show that the Hubble constant H0 can be constrained to about 2% precision in the HDE model with the Macquart relation of FRB by using 10000 accurately-localized FRBs combined with the current CMB data, which is similar to the precision of the SH0ES value. Using 10000 localized FRBs combined with the CMB data can achieve about 6% constraint on the dark-energy parameter c in the HDE model, which is tighter than the current BAO data combined with CMB. We also study the combination of the FRB data and another low-redshift cosmological probe, i.e. gravitational wave (GW) standard siren data, with the purpose of measuring cosmological parameters independent of CMB. Although the parameter degeneracies inherent in FRB and in GW are rather different, we find that more than 10000 FRBs are demanded to effectively improve the constraints in the holographic dark energy models. © 2021, CC BY.

关键词： Holography

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Superradiant dark matter production from primordial black holes: Impact of multiple modes and gravitational wave emission

arXiv

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arXiv 2025年

作者： Jia, Nayun Bao, Shou-Shan Zhang, Chen Zhang, Hong Zhang, Xin Liaoning Key Laboratory of Cosmology and Astrophysics College of Sciences Northeastern University Shenyang110819 China Shandong University Qingdao266237 China MOE Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China

Rotating primordial black holes (PBHs) in the early universe can emit particles through superradiance, a process particularly efficient when the particle’s Compton wavelength is comparable to the PBH’s gravitational radius. Superradiance leads to an exponential growth of particle occupation numbers in gravitationally bound states. We present an analysis of heavy bosonic dark matter (DM) production through three gravitational mechanisms: Hawking radiation, superradiant instabilities, and ultraviolet (UV) freeze-in. We consider PBHs that evaporate before Big Bang Nucleosynthesis (BBN). For both scalar and vector DM, our analysis incorporates the evolution of a second superradiant mode. We demonstrate that the growth of a second superradiant mode causes the decay of the first mode, and thus the second mode cannot further enhance the DM abundance beyond that already achieved by the first mode. Our study also reveals that while superradiance generally enhances DM production, gravitational wave (GW) emission from the superradiant cloud may significantly modify this picture. For scalar DM, GW emission reduces the parameter space where superradiance effectively augments relic abundance. For vector DM, rapid GW emission from the superradiant cloud may yield relic abundances below those achieved through Hawking radiation alone. These findings demonstrate that multiple-mode effect and GW emission play critical roles in modeling DM production from PBHs in the early universe. Copyright © 2025, The Authors. All rights reserved.

关键词： Luminescence

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Galaxy-Scale Test of General Relativity with Strong Gravitational Lensing

arXiv

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arXiv 2021年

作者： Liu, Xiao-Hui Li, Zhen-Hua Qi, Jing-Zhao Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Ministry of Education Shenyang110819 China

Although general relativity (GR) has been precisely tested at the solar system scale, precise tests at a galactic or cosmological scale are still relatively insufficient. Here, in order to test GR at the galactic scale, we use the newly compiled galaxy-scale strong gravitational lensing (SGL) sample to constrain the parameter γPPN in the parametrized post-Newtonian (PPN) formalism. We employ the Pantheon sample of type Ia supernovae observation to calibrate the distances in the SGL systems using the Gaussian Process method, which avoids the logical problem caused by assuming a cosmological model within GR to determine the distances in the SGL sample. Furthermore, we consider three typical lens models in this work to investigate the influences of the lens mass distributions on the fitting results. We find that the choice of the lens models has a significant impact on the constraints on the PPN parameter γPPN. By using the minimum χ2 comparison and the Bayesian information criterion as evaluation tools to make comparisons for the fitting results of the three lens models, we find that the most reliable lens model gives the result of γPPN = 1.065+0.064−0.074, which is in good agreement with the prediction of γPPN = 1 by GR. As far as we know, our 6.4% constraint result is the best result so far among the recent works using the SGL method. © 2021, CC BY.

关键词： Relativity

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The Three Hundred Project: The relationship between the shock and splashback radii of simulated galaxy clusters

arXiv

引用

arXiv 2024年

作者： Zhang, M. Walker, K. Sullivan, A. Power, C. Cui, W. Li, Y. Zhang, X. College of Sciences Northeastern University Shenyang110819 China International Centre for Radio Astronomy Research The University of Western Australia 35 Stirling Highway CrawleyWA6009 Australia Australia Departamento de Física Teórica Módulo 15 Facultad de Ciencias Universidad Autónoma de Madrid Madrid28049 Spain Universidad Autónoma de Madrid Cantoblanco MadridE-28049 Spain Key Laboratory of Data Analytics and Optimization for Smart Industry Ministry of Education Northeastern University Shenyang110819 China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China

Observations of the intracluster medium (ICM) in the outskirts of galaxy clusters reveal shocks associated with gas accretion from the cosmic web. Previous work based on non-radiative cosmological hydrodynamical simulations have defined the shock radius, rshock, using the ICM entropy, K ∝ T/ne2/3, where T and ne are the ICM temperature and electron density respectively;the rshock is identified with either the radius at which K is a maximum or at which its logarithmic slope is a minimum. We investigate the relationship between rshock, which is driven by gravitational hydrodynamics and shocks, and the splashback radius, rsplash, which is driven by the gravitational dynamics of cluster stars and dark matter and is measured from their mass profile. Using 324 clusters from The Three Hundred project of cosmological galaxy formation simulations, we quantify statistically how rshock relates to rsplash. Depending on our definition, we find that the median rshock 1.38rsplash(2.58R200) when K reaches its maximum and rshock 1.91rsplash(3.54R200) when its logarithmic slope is a minimum;the best-fit linear relation increases as rshock ∝ 0.65rsplash. We find that rshock/R200 and rsplash/R200 anti-correlate with virial mass, M200, and recent mass accretion history, and rshock/rsplash tends to be larger for clusters with higher recent accretion rates. We discuss prospects for measuring rshock observationally and how the relationship between rshock and rsplash can be used to improve constraints from radio, X-ray, and thermal Sunyaev-Zeldovich surveys that target the interface between the cosmic web and clusters. Copyright © 2024, The Authors. All rights reserved.

关键词： Dark Matter

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Genome-wide CRISPR screens identify key regulators of adipogenesis and glucose uptake in beige adipocytes

引用

Biochemical and biophysical research communications 2025年 774卷 152093页

作者： Zhuo Zuo Ruipu Liang Shuangshuang Fan Haihuan Shan Han Zhang Xiaofeng Wang Teng Fei Key Laboratory of Bioresource Research and Development of Liaoning Province College of Life and Health Sciences Northeastern University Shenyang 110819 China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang 110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry (Northeastern University) Ministry of Education Shenyang 110819 China Foshan Graduate School of Innovation Northeastern University Foshan 528311 China. Key Laboratory of Data Analytics and Optimization for Smart Industry (Northeastern University) Ministry of Education Shenyang 110819 China. Foshan Graduate School of Innovation Northeastern University Foshan 528311 China. Electronic address: feiteng@***.

The beiging of white adipocytes enhances energy expenditure by utilizing fatty acids and glucose, offering therapeutic potential against obesity and type 2 diabetes. However, the genetic mechanisms driving this process remain unclear. Here, we performed multiple fluorescence-activated cell sorting (FACS)-based genome-wide CRISPR loss-of-function screens in beige adipocytes with or without insulin resistance (IR) induction, and systematically identified functional regulators of beige adipocyte adipogenesis and glucose metabolism. We further integrated transcriptomics and human genetics data to pinpoint key genes for adipogenesis and glucose metabolism in beige adipocytes. Moreover, we validated SULT2B1 and ATP1B2 as key adipogenesis genes for beige adipocytes, and COMMD7 gene as important regulator for glucose uptake against IR. These findings not only provide a comprehensive and valuable resource for cataloguing candidate functional genes underlying lipid and glucose homeostasis in beige adipocytes, but also offer potential therapeutic targets against metabolic disorders.

关键词： Adipogenesis Beige adipocyte CRISPR Glucose

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Gravitational wave standard sirens and cosmological parameter measurement

引用

Science China(Physics,Mechanics & Astronomy) 2019年第11期62卷 146-150页

作者： Xin Zhang Department of Physics College of Sciences Northeastern University Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Center for High Energy Physics Peking University

The first detection of gravitational waves (GWs) produced by the binary neutron star (BNS) merger in August 17, 2017[1] is fairly meaningful because it initiated the new era of multi-messenger astronomy. In this BNS m... 详细信息

关键词： CDM Gravitational wave standard sirens and cosmological parameter measurement

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